Caption:
Franciscan friar and mathematician Luca Pacioli (1445 - c.1514), known as the father of accounting, teaching the Duke of Urbino Guidobaldo Da Montefeltro. The painting is attributed to Jacopo de' Barbari. Pictured on the table are various geometrical tools. A rhombicuboctahedron, half filled with water, hangs from the ceiling.